#include <bits/stdc++.h>
using namespace std;
#define gc getchar_unlocked
#define fo(i, n) for (int i = 0; i < n; i++)
#define rfo(i, n) for (int i = n - 1; i >= 0; i--)
#define REP(i, a, b) for (int i = a; i < b; i++)
#define RREP(i, a, b) for (int i = a; i >= b; i--)
#define ll long long
#define si(x) scanf("%d", &x)
#define sl(x) scanf("%lld", &x)
#define ss(s) scanf("%s", s)
#define pi(x) printf("%d\n", x)
#define pl(x) printf("%lld\n", x)
#define ps(s) printf("%s\n", s)
#define deb(x) cout << #x << "=" << x << endl
#define deb2(x, y) cout << #x << "=" << x << "," << #y << "=" << y << endl
#define deb3(x, y, z) cout << #x << "=" << x << "," << #y << "=" << y << "," << #z << "=" << z << endl
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define clr(x) memset(x, 0, sizeof(x))
#define sortall(x) sort(all(x))
#define tr(it, a) for (auto it = a.begin(); it != a.end(); it++)
#define PI 3.1415926535897932384626
typedef pair<int, int> pii;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpii;
typedef vector<pl> vpl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
int mpow(int base, int exp);
const int mod = 1'000'000'007;
const int N = 3e5, M = N;
vpl g[N];
ll a[N], depth[N];
void dfs(int cur)
{
for (auto e : g[cur])
{
depth[e.F] = depth[cur] + e.S;
dfs(e.F);
}
}
void solve()
{
int n, m;
cin >> n >> m;
fo(i, n + m)
{
ll x, y;
cin >> x >> y;
x--;
g[x].pb({i + 1, y});
}
dfs(0);
ll ans = 1e18;
fo(i, m)
{
// chosen val
ll cv = depth[i + 1 + n];
vl changes;
bool ok = true;
fo(j, m)
{
changes.pb(cv - depth[j + 1 + n]);
}
sortall(changes);
ll mv = changes[changes.size() / 2];
mv = max(-depth[1], mv);
ll temp = abs(mv);
for (auto e : changes)
{
temp += abs(e - mv);
}
ans = min(temp, ans);
}
cout << ans << '\n';
return;
}
int main()
{
ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
srand(chrono::high_resolution_clock::now().time_since_epoch().count());
int t = 1;
int cs = 0;
while (t - cs)
{
solve();
cs++;
}
return 0;
}
int mpow(int base, int exp)
{
base %= mod;
int result = 1;
while (exp > 0)
{
if (exp & 1)
result = ((ll)result * base) % mod;
base = ((ll)base * base) % mod;
exp >>= 1;
}
return result;
}
Compilation message
fireworks.cpp: In function 'void solve()':
fireworks.cpp:73:14: warning: unused variable 'ok' [-Wunused-variable]
73 | bool ok = true;
| ^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
7244 KB |
Output is correct |
| 2 |
Incorrect |
4 ms |
7244 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
4 ms |
7244 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
7244 KB |
Output is correct |
| 2 |
Incorrect |
4 ms |
7244 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
7244 KB |
Output is correct |
| 2 |
Incorrect |
4 ms |
7244 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
